How to Design a Customized NdFeB Magnet.
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How to Design a Customized NdFeB Magnet

Customized NdFeB magnet is a term used to describe magnets that have been specifically designed and manufactured to meet specific customer specifications. These magnets are the driving force behind high-efficiency magnetic systems across various industries. They power applications from electric motors and generators to magnetic separation and medical imaging. Their exceptional magnetic properties and compact size make them ideal for use in a range of industries.

When designing a bespoke magnet it is important to consider factors such as the magnetic field strength, the required temperature, the application and the environment. This is because the choice of magnets will have a significant impact on the performance and reliability of the finished product. To ensure that the resulting magnet meets all of these requirements, it is necessary to have an in-depth understanding of the magnet’s physical properties and how they relate to each other.

The first step in designing a custom magnet is to select the correct grade of NdFeB. This is based on the desired magnetic field strength (BHmax), temperature range and other specific properties such as the coercivity.

To determine the optimal magnet for a specific application, it is crucial to perform FEMM modelling. This software solves magnetic problems in a 2D plane and evaluates different design options.

Once the design has been simulated, it is time to start the manufacturing process. The FEMM model will be translated into a 3D CAD model, which is then used to calculate the dimensions of the magnet and its components.

This information is then passed onto a CNC machine, which cuts the magnet to its final dimensions. It is important to note that the magnet must be machined before it can be bonded and coated, so that the coating does not melt or otherwise degrade in the machining process.

The pressed block is then wrapped in paper similar to wax paper and vacuum sealed to keep it from being exposed to oxygen. This is critical because oxygen can significantly reduce a magnet’s performance. It is also important to protect the pressed block from vibration and shock, as these can damage the magnetic properties of the magnet.

Finally, the pressed block is then magnetized using a coil of copper wire. This is a complex process that involves generating high levels of electricity, which causes the domains inside the magnet to line up in the same direction. This creates the north and south poles of the magnet.